全文获取类型
收费全文 | 2224篇 |
免费 | 98篇 |
国内免费 | 809篇 |
专业分类
安全科学 | 172篇 |
废物处理 | 135篇 |
环保管理 | 161篇 |
综合类 | 1237篇 |
基础理论 | 387篇 |
污染及防治 | 743篇 |
评价与监测 | 78篇 |
社会与环境 | 59篇 |
灾害及防治 | 159篇 |
出版年
2024年 | 1篇 |
2023年 | 45篇 |
2022年 | 123篇 |
2021年 | 105篇 |
2020年 | 62篇 |
2019年 | 70篇 |
2018年 | 82篇 |
2017年 | 108篇 |
2016年 | 134篇 |
2015年 | 167篇 |
2014年 | 159篇 |
2013年 | 226篇 |
2012年 | 179篇 |
2011年 | 188篇 |
2010年 | 151篇 |
2009年 | 124篇 |
2008年 | 146篇 |
2007年 | 120篇 |
2006年 | 104篇 |
2005年 | 77篇 |
2004年 | 63篇 |
2003年 | 74篇 |
2002年 | 61篇 |
2001年 | 58篇 |
2000年 | 59篇 |
1999年 | 80篇 |
1998年 | 62篇 |
1997年 | 56篇 |
1996年 | 49篇 |
1995年 | 49篇 |
1994年 | 27篇 |
1993年 | 38篇 |
1992年 | 31篇 |
1991年 | 24篇 |
1990年 | 14篇 |
1989年 | 3篇 |
1988年 | 5篇 |
1987年 | 1篇 |
1984年 | 3篇 |
1981年 | 2篇 |
1958年 | 1篇 |
排序方式: 共有3131条查询结果,搜索用时 15 毫秒
661.
In the context of water treatment, the ferrate ([FeO(4)](2-)) ion has long been known for its strong oxidizing power and for producing a coagulant from its reduced form [i.e., Fe(III)]. However, it has not been widely applied in water treatment, because of preparation difficulties and high cost. This article describes a low-cost procedure for producing solid potassium ferrate. In this synthetic procedure, NaClO was used in place of chlorine generation; and 10?M KOH was used in place of saturated KOH in the previous procedures. In addition, this study investigated the reactions of potassium ferrate with tetracycline hydrochloride (TC) at different pH and molar ratios. Results showed that the optimal pH range for TC degradation was pH 9-10, and TC could be mostly removed by Fe(VI) in 60?s. However, results showed >70% of TC degraded and <15% of dissolved organic carbon (DOC) reduction at molar ratio of 1:20. The main degradation pathway of TC is proposed based on the experimental data. 相似文献
662.
663.
针对日趋严重的电网短路电流超标问题,采用基于爆炸式快速开断载流桥体的大容量高速开关装置(Fast Switching Release,FSR)与限流电抗器一体技术研制了“节能型限流装置”,并在宁夏220 kV步桥变电站成功运行;基于高速大遮断容量真空断路器技术、短路电流快速识别技术、相控技术与限流电抗器相结合研制了“330 kV 开关型零损耗电网限流装置”,并在宁夏330 kV迎安I线成功进行2次短路试验。现场运行及试验结果表明:2种开关型高压电网故障限流装置从根本上解决了电网故障限流技术实用化中面临的安全性、可靠性以及经济性等关键问题,标志着电网故障限流技术取得了一个突破性的进展。 相似文献
664.
665.
666.
667.
Lihui Gao Yijun Cao Lizhang Wang Shulei Li 《Frontiers of Environmental Science & Engineering》2022,16(6):77
668.
A study was conducted to investigate the effect of organic acids on Cd and Cu desorption from natural contaminated soils (NCS) with permanent contamination by metal smelters and from artificial contaminated soils (ACS) derived from an artificial amendment of Cd to three representative zonal soils in Central China. Results showed that the desorption of Cd in either NCS or ACS, with the increment of tartrate or citrate concentration in desorption solution, can be characterized as a valley-like curve. The presence of tartrate or citrate at a low concentration (< or =0.5 mmol/l) inhibited Cd desorption from these two types of soils, whereas the presence of organic acids at high concentrations (> or =2 mmol/l for citrate and about > or =15 mmol/l for tartrate) apparently promoted Cd desorption. The desorption curve of Cu by tartrate solution with different tartrate concentrations can also be characterized as a valley-like curve, while the desorption of Cu in the presence of citrate was directly enhanced with the increment of citrate concentration. With the enhancement of initial pH value from 2 to 8 in the presence of citrate, Cu desorption ratio decreased at the first stage, then increased, and then decreased again. A valley and a peak sequentially appeared in the Cd or Cu desorption curve with initial pH value increment. Compared with citrate, the desorption ratio of Cd or Cu from NCS or ACS was directly decreased in the presence of tartrate, with the enhancement of the pH value from 2 to 8. Cd or Cu desorption was clearly enhanced when the electrolyte concentration of KNO3 or KCl increased in the presence of 2 mmol/l tartrate. Moreover, a higher desorption ratio of Cd or Cu was shown with KCl electrolyte than with KNO3 electrolyte with the same concentration. Based on these observations, we suggest that bioavailabilities of heavy metal can be promoted with selected suitable types and concentrations of organic acid amendment and reasonable field condition. 相似文献
669.
高福晖 《中国人口.资源与环境》1992,(4)
经过六年多的研究,笔者认为:三峡工程对生态环境的影响有有利影响和不利影响两个方面。对不利影响只要认真对待,采取措施,可以减少到最小程度,所以生态环境问题不是三峡工程决策的制约因素。 相似文献
670.
The intensity of environmental regulation (ERI) affects the short-term effect of the level of green mining (GML), and which structure determines the long-term mechanism. Based on the panel data from 2001 to 2015, with the dynamic panel model and system GMM estimation method were employed to test the influence of heterogeneous environmental regulation on green mining and its transmission mechanism. The results show that, there is a “U” type nonlinear relationship between the ERI and GML. The direct effect of command-control-based (CAC) and the market incentive-based (MBI) environmental regulation on green development of mining shows the characteristics of inhibition and promotion. There is a “U” type of indirectly moderating effect between technological innovation and the energy consumption structure on the GML. The technological innovation promotes the green development of the mining industry only after pass the inflection point of MBI, while the CAC plays a significant guiding role in upgrading of the energy consumption structure. There is an inhibition and promotion effect of MBI on the GML in the southeast coastal area, and the CAC is not significantly. Meanwhile, both of the ERI shows no positive effects in the central and western inland region. 相似文献